CN113262838A - Pretreatment method and system for detecting metal content in soil - Google Patents
Pretreatment method and system for detecting metal content in soil Download PDFInfo
- Publication number
- CN113262838A CN113262838A CN202110526502.8A CN202110526502A CN113262838A CN 113262838 A CN113262838 A CN 113262838A CN 202110526502 A CN202110526502 A CN 202110526502A CN 113262838 A CN113262838 A CN 113262838A
- Authority
- CN
- China
- Prior art keywords
- soil
- crushing
- pretreatment method
- equipment
- pretreatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C1/00—Crushing or disintegrating by reciprocating members
- B02C1/005—Crushing or disintegrating by reciprocating members hydraulically or pneumatically operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
- B02C18/12—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers with drive arranged below container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C18/18—Knives; Mountings thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
Abstract
The invention provides a pretreatment method and a pretreatment system for detecting metal content in soil, which are characterized by comprising the following steps: sequentially performing crisping treatment and crushing treatment on the soil to be detected; performing crisp pressing treatment to soften the soil to be detected; and the soil to be detected is crushed into a preset size through the crushing treatment. The method is rapid and convenient, is simple to operate, has a good effect, saves a large number of personnel, and greatly improves the working efficiency.
Description
Technical Field
The invention relates to the field of analysis, in particular to a method and a system for pre-treatment of metal content in soil.
Background
With the aggravation of industrial and urban pollution and the increase of the variety and the quantity of agricultural chemicals, the heavy metal pollution of soil is increasingly serious, the pollution degree is aggravated, and the area is enlarged year by year. Heavy metal pollutants have poor movement in soil and long residence time, cannot be degraded by microorganisms, and can finally affect human health through media such as water, plants and the like.
When the prior soil is pretreated during detection, two processes are needed in the pretreatment process of a sample when the content of the soil metal is detected according to the technical Specification for monitoring the soil environment of HJ/T166; coarse grinding of the sample and fine grinding of the sample.
Wherein, the rough grinding of the sample (1) adopts a wooden hammer, a wooden roller, an organic glass rod, a hard wooden board and the like, and the sample can not be crushed to 20 meshes by a metal tool. At present, a wood bar is used for beating soil particles manually, then a wood roller is used for rolling, and a sample is processed for more than ten minutes, which is relatively time-consuming and labor-consuming; each batch contains dozens or even hundreds of soil samples, and a large number of manual operators are required.
(2) The sample is finely ground by using agate jars and agate balls to 60 meshes and 100 meshes. The operation is complicated and the time is long by adopting the agate jar and the agate ball.
Disclosure of Invention
The invention aims to overcome the defects and designs a new pretreatment scheme, a pressure mechanism crusts and crushes hard soil particles, the method is high in speed and can be completed within a few seconds, and the crusted soil particles become small and crisp and are easy to crush; then, the soil is crushed at a high rotating speed by a soil crusher adopting a plastic cutter, 20 meshes can be achieved within about 5 seconds, 60 meshes can be achieved within about 30 seconds, and 100 meshes can be achieved within 1 minute; the method is rapid and convenient, is simple to operate, has a good effect, saves a large number of personnel, and greatly improves the working efficiency.
The invention provides a pretreatment method for detecting metal content in soil, which is characterized by comprising the following steps: sequentially performing crisping treatment and crushing treatment on the soil to be detected;
performing the crisp pressing treatment to soften the soil to be detected;
and the soil to be detected is crushed into a preset size through the crushing treatment.
Further, the invention provides a pretreatment method for detecting the metal content in the soil, which is characterized by comprising the following steps:
the crisp pressing treatment is realized by crisp pressing equipment;
the crisp pressing equipment comprises an equipment frame body, a jacking mechanism and a counter-force mechanism;
wherein, the jacking mechanism is provided with a jacking platform;
the jacking platform moves back and forth in the height direction relative to the equipment frame body;
the counter-force mechanism is fixedly arranged at the top of the equipment frame body;
when the jacking platform performs reciprocating motion, the jacking platform is close to or far away from the counterforce mechanism.
Further, the invention provides a pretreatment method for detecting the metal content in the soil, which is characterized by comprising the following steps:
the counter-force mechanism is provided with an extrusion die at a position opposite to the jacking platform;
the jacking platform is provided with a bearing container capable of accommodating samples;
the extrusion die is matched with the shape and the size of the bearing container.
Further, the invention provides a pretreatment method for detecting the metal content in the soil, which is characterized by comprising the following steps:
the crushing treatment is realized by crushing equipment;
the crushing equipment is provided with the crushing cutter head made of non-metallic materials.
Further, the invention provides a pretreatment method for detecting the metal content in the soil, which is characterized by comprising the following steps:
the crushing cutter head comprises a plurality of crushing blades which are arranged in pairs;
the crushing blades of each pair are arranged in a staggered way in the opposite up-down direction.
Further, the invention provides a pretreatment method for detecting the metal content in the soil, which is characterized by comprising the following steps:
the inclined angles of the crushing blades are different or not completely the same;
the angle of inclination is chosen between 50-70 deg..
Further, the invention provides a pretreatment method for detecting the metal content in the soil, which is characterized by comprising the following steps:
the crushing blade is provided with an inclined surface;
the angle of the inclined plane is selected between 20-80 degrees;
wherein the bevel of the crushing blade positioned above is downward;
the lower crushing blade is inclined upwards.
In addition, the invention also provides a processing system, which is characterized in that:
comprises a pretreatment platform;
a plurality of crisp pressing stations and a plurality of crushing stations are arranged on the pretreatment platform;
the crisp pressing station is provided with crisp pressing equipment;
and the crushing station is provided with crushing equipment.
Further, the processing system is characterized in that:
the pretreatment platform also comprises a conveying mechanism;
the conveying mechanism extracts the container filled with the soil to be detected or the soil to be detected and conveys the container to a target station.
Further, the processing system is characterized in that:
the pretreatment platform also comprises a plurality of sieving stations;
the sieving station is provided with sieving equipment for sieving soil to be tested with target particle size;
above-mentioned equipment of sieving, the screen cloth in appointed aperture is installed to detachable.
Further, the processing system is characterized in that:
the system also comprises a central control system;
the central control system is electrically connected with each functional mechanism/device, receives feedback from each functional mechanism/device, and sends a work instruction to each functional mechanism/device.
Drawings
Fig. 1 is a schematic view of a pretreatment system for detecting metal content in soil according to this embodiment;
fig. 2 is a schematic structural diagram of a crisping pressing mechanism related to a pretreatment system for detecting metal content in soil according to this embodiment;
FIG. 3 is a schematic structural diagram of a crushing mechanism of the pretreatment system for detecting metal content in soil according to the embodiment;
fig. 4 is a schematic diagram of a pretreatment system for detecting metal content in soil according to the modification of the present embodiment.
Detailed Description
In the embodiment, a pretreatment system and a method for a soil sample, which can be fully or semi-automatically performed, are provided.
In the embodiment, the soil sample is crushed after being pressed, so that the pretreatment time can be saved, the operation process is simple and convenient, the supporting facilities derived based on the method can realize the effect of full-automatic or semi-automatic operation, the addition of unnecessary interference substances in manual operation procedures is avoided, the pretreatment time can be greatly shortened, the supporting equipment is easy to obtain, and a favorable material basis is provided for the popularization of the system.
Specifically, as shown in fig. 1, in the present embodiment, the treatment system applicable to the pretreatment method for detecting the metal content in the soil includes a pretreatment platform 1;
a crisp pressing working area 10 and a crushing working area 20 are arranged on the pretreatment platform;
the arrays in the crisping work area 10 are equipped with 6 crisping devices 100;
the specific structure of the crisp pressing equipment is shown in fig. 2, and comprises an equipment frame body 110 and a hydraulic pneumatic jack 120;
the equipment rack 110 comprises a support rack body, a fixed upper plate 130 and a fixed bottom plate 111;
the support frame body is generally vertically arranged;
the top end of the support frame body is fixed with a fixed upper plate 130 which plays a role of reverse force;
a fixed bottom plate 111 is fixed at the bottom end of the support frame body and plays a role of fixing equipment;
the bottom of the hydraulic pneumatic jack 120 is fixed on the fixed bottom plate 111;
this hydropneumatic jack 120's top surface is installed and is removed medium plate 121 (or should remove that medium plate 121 itself can reciprocate install on supporting the support frame body, and hydropneumatic jack 120's top butt removes medium plate 121), and whatever kind of structure, its homoenergetic realizes, under hydropneumatic jack 120's effect, removes medium plate 121 and can carry out reciprocating motion's effect in vertical direction.
The top surface of the movable middle plate 121 can accommodate a plastic sample accommodating tray 122 during use;
the fixed upper plate 130 is further provided with a hard plastic plate 131 at a position opposite to the sample holding tray 122, the radial length of the hard plastic plate 131 is slightly smaller than the sample holding tray 122, and the shape of the hard plastic plate 131 is similar to that of the sample holding tray 122, so that the hard plastic plate 131 can just extend into the sample holding tray 122 to be extruded in the extrusion process.
As shown in fig. 1, the array in the pulverizing work area 20 is equipped with 6 pulverizing apparatuses 200.
The specific structure of the crushing apparatus 200 is shown in fig. 3, and comprises a crusher body 200;
this rubbing crusher body 200 is the molding of traditional breaker/rubbing crusher, including control panel 201 (be used for adjusting rotational speed fender position and time etc.), plastic cutter 210 to and the cup 220 of plastics or glass material, on the one hand does not contain the metal and does not influence the testing result, and on the other hand glass cup and plastic cutter also conveniently wash.
Specifically, the cutter 210 is preferably made of nylon-carbon fiber-added plastic, has high hardness, is wear-resistant, does not contain metal, replaces stainless steel as a blade material, and meets the requirements on the material in the standard HJ/T166;
in the embodiment, 4 blades are preferably adopted, 2 above and 2 below are symmetrical in position and balanced in stress, and the angle of each blade is different (the angle between the blade and a bearing is 50-70 degrees), so that soil particles can be crushed at different positions; the number and angle settings of the blades can be varied according to the actual application.
In the embodiment, a thicker blade is preferably adopted, and the impact between the contact part of the blade and soil is utilized to crush soil particles, so that the contact area with the soil is increased, the crushing efficiency is improved, and the service life of the blade is prolonged;
in the embodiment, a bevel blade is preferably adopted, a certain thickness of the front end of the blade is kept about 1mm, and a bevel (the angle is about 45 degrees and is 20-80 degrees) is made to reduce the resistance; the inclined planes of the upper blade and the lower blade are different in direction, the inclined plane of the upper blade faces downwards, the inclined plane of the lower blade faces upwards, the soil can roll quickly, the cup body does not need to be shaken, and the soil on the upper layer and the soil on the lower layer can be thoroughly crushed.
In the embodiment, the preferable cutter only has one threaded opening, so that the installation is simple and convenient;
in this embodiment, a thick glass is preferred, which is metal-free, easy to clean, strong, durable, and not prone to toppling.
In the embodiment, a hydraulic machine and a reaction frame are adopted to press hard soil particles to be crisp and crushed by pressure; the speed is high, and the operation can be finished within a few seconds; the soil particles after being pressed to be crisp become small and crisp and are easy to crush; then, the soil pulverizer adopting the plastic cutter is used for pulverizing at a high rotating speed, and can achieve 20 meshes in about 5 seconds, 60 meshes in about 30 seconds and 100 meshes in 1 minute for 500g of soil; the method is rapid and convenient, is simple to operate, has a good effect, saves a large number of personnel, and greatly improves the working efficiency.
As a modification of the present embodiment:
as shown in fig. 4, a fully automated operation platform is also provided.
The treatment system of the pretreatment method for detecting the metal content in the soil provided by the modification comprises a pretreatment platform 1;
on the pretreatment platform, a crisp pressing working area 10, a crushing working area 20 and a sieving working area 30 are arranged;
as in the previous embodiment, the array in the crisping station 10 is equipped with 6 crisping units 100;
the array in the crushing work area 20 is provided with 6 crushing devices 200;
the array in the sieving working area 30 is provided with 6 sieving screens 300 (the size of the mesh of the sieving screens can be assembled according to the actual use requirement, and a receiving disc is arranged right below each sieving screen);
on the pretreatment platform, tracks are arranged around the crisp pressing working area 10, the crushing working area 20 and the sieving working area 30;
the track is equipped with a plurality of mobile devices 400 (such as six-axis robot arms) with grabbing function, and the sample trays can be circulated in each working area through the action of the mobile devices.
In consideration of the full automation, the system is also provided with a central control system;
the central control system is electrically connected with each functional mechanism/device, receives feedback from each functional mechanism/device and sends a working instruction to each functional mechanism/device;
the feedback information typically includes a work progress report for a particular job.
The work order can be set on site at the front end of the equipment or through presetting, such as: the preset crisp pressing time of the jack is 15s, 25s or 50s and the like, the crisp pressing frequency (namely, the reciprocating times) is 1 time, 3 times, 5 times and the like, the rotating speed of the crushing equipment is 5000 revolutions per minute, 10000 revolutions per minute or 20000 revolutions per minute and the like, the crushing time of the crushing equipment is 10s, 20s or 50s and the like, and the crushing frequency of the crushing equipment is 1 time, 2 times or 5 times and the like.
Claims (11)
1. A pretreatment method for detecting metal content in soil is characterized by comprising the following steps: sequentially performing crisping treatment and crushing treatment on the soil to be detected;
performing crisp pressing treatment to soften the soil to be detected;
and the soil to be detected is crushed into a preset size through the crushing treatment.
2. The pretreatment method for detecting the content of metals in soil according to claim 1, characterized in that:
the crisp pressing treatment is realized by crisp pressing equipment;
the crisp pressing equipment comprises an equipment frame body, a jacking mechanism and a counter-force mechanism;
the jacking mechanism is provided with a jacking platform;
the jacking platform moves back and forth in the height direction relative to the equipment frame body;
the counter-force mechanism is fixedly arranged at the top of the equipment frame body;
when the jacking platform performs reciprocating motion, the jacking platform is close to or far away from the counterforce mechanism.
3. The pretreatment method for detecting the content of metals in soil according to claim 1, characterized in that:
the counter-force mechanism is provided with an extrusion die at a position opposite to the jacking platform;
the jacking platform is provided with a bearing container capable of accommodating a sample;
the extrusion die is matched with the shape and the size of the bearing container.
4. The pretreatment method for detecting the content of metals in soil according to claim 1, characterized in that:
the crushing treatment is realized by crushing equipment;
the crushing equipment is provided with a crushing cutter head made of non-metallic materials.
5. The pretreatment method for detecting the content of metals in soil according to claim 4, wherein the pretreatment method comprises the following steps:
the crushing cutter head comprises a plurality of crushing blades which are arranged in pairs;
the crushing blades of each pair are arranged in a staggered way in the opposite up-down direction.
6. The pretreatment method for detecting the metal content in the soil according to claim 5, wherein the pretreatment method comprises the following steps:
the inclination angles of the crushing blades are different or not completely the same;
the angle of inclination is selected between 50-70 deg..
7. The pretreatment method for detecting the metal content in the soil according to claim 5, wherein the pretreatment method comprises the following steps:
the crushing blade is provided with a bevel;
the angle of the inclined plane is selected between 20-80 degrees;
wherein the crushing blade positioned above is inclined downwards;
the lower crushing blade is inclined upwards.
8. The treatment system applied to the pretreatment method for detecting the metal content in the soil according to any one of claims 1 to 7, wherein:
comprises a pretreatment platform;
a plurality of crisp pressing stations and a plurality of crushing stations are arranged on the pretreatment platform;
the crisp pressing station is provided with crisp pressing equipment;
and the crushing station is provided with crushing equipment.
9. The processing system of claim 8, wherein:
the pretreatment platform also comprises a conveying mechanism;
and the conveying mechanism is used for extracting the container filled with the soil to be detected or the soil to be detected and conveying the container to the target station.
10. The processing system of claim 8, wherein:
the pretreatment platform also comprises a plurality of sieving stations;
the sieving station is provided with sieving equipment for sieving soil to be tested with target particle size;
the sieving equipment is detachably provided with a screen with a designated aperture.
11. The processing system of claim 8, wherein:
the system also comprises a central control system;
the central control system is electrically connected with each functional mechanism/device, receives feedback from each functional mechanism/device, and sends work instructions to each functional mechanism/device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110526502.8A CN113262838B (en) | 2021-05-14 | 2021-05-14 | Pretreatment method and system for detecting metal content in soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110526502.8A CN113262838B (en) | 2021-05-14 | 2021-05-14 | Pretreatment method and system for detecting metal content in soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113262838A true CN113262838A (en) | 2021-08-17 |
| CN113262838B CN113262838B (en) | 2023-07-11 |
Family
ID=77230867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110526502.8A Active CN113262838B (en) | 2021-05-14 | 2021-05-14 | Pretreatment method and system for detecting metal content in soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113262838B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208373270U (en) * | 2018-05-09 | 2019-01-15 | 磨春礼 | A kind of grinding device of the soil of agricultural machinery |
| CN110201974A (en) * | 2019-05-30 | 2019-09-06 | 耿静 | Electronic waste crushing and screening device |
| CN111257087A (en) * | 2020-04-16 | 2020-06-09 | 宁波江南仪器厂 | Soil crushing treatment equipment |
| CN212068873U (en) * | 2020-03-04 | 2020-12-04 | 贺拥军 | Hydraulic engineering breaker |
| CN112026237A (en) * | 2020-08-25 | 2020-12-04 | 浙江大学 | Automatic film clamp of overall process soil |
| CN213091423U (en) * | 2020-04-23 | 2021-04-30 | 吉林省林业科学研究院 | Soil nitrogen phosphorus potassium detection device |
-
2021
- 2021-05-14 CN CN202110526502.8A patent/CN113262838B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208373270U (en) * | 2018-05-09 | 2019-01-15 | 磨春礼 | A kind of grinding device of the soil of agricultural machinery |
| CN110201974A (en) * | 2019-05-30 | 2019-09-06 | 耿静 | Electronic waste crushing and screening device |
| CN212068873U (en) * | 2020-03-04 | 2020-12-04 | 贺拥军 | Hydraulic engineering breaker |
| CN111257087A (en) * | 2020-04-16 | 2020-06-09 | 宁波江南仪器厂 | Soil crushing treatment equipment |
| CN213091423U (en) * | 2020-04-23 | 2021-04-30 | 吉林省林业科学研究院 | Soil nitrogen phosphorus potassium detection device |
| CN112026237A (en) * | 2020-08-25 | 2020-12-04 | 浙江大学 | Automatic film clamp of overall process soil |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113262838B (en) | 2023-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101672736B (en) | Sample pre-treatment device for analysis of pesticide residues in fruits and vegetables and analysis of pesticide residues in fruits and vegetables | |
| WO2013156923A2 (en) | Device for extracting analytes | |
| CN103639030A (en) | Multi-stage adjustable soil sample grinder | |
| CN111451261A (en) | System and method for removing metal components in soil | |
| CN113262838A (en) | Pretreatment method and system for detecting metal content in soil | |
| CN208852995U (en) | A kind of Bioexperiment grinding device | |
| CN210411292U (en) | All-round automated inspection spraying device of sheet metal component | |
| CN112515135A (en) | Extrusion thickness adjustable dried persimmon press device | |
| CN209530982U (en) | Open-air processing equipment of soil sample | |
| CN214555233U (en) | Filtering device | |
| CN111879588B (en) | Agricultural product harmful element residue detection pretreatment system and pretreatment process | |
| CN111889209B (en) | Novel chemical material screening machine for chemical industry | |
| CN112058356B (en) | Chemical industry pigment bottle breaker | |
| CN212621976U (en) | Anti testing machine of rolling over of concrete test block | |
| CN114733599A (en) | Raw material crushing device for water treatment agent preparation | |
| CN210923224U (en) | Quick mashing equipment for analysis and detection of leaf vegetables agricultural products | |
| CN210552374U (en) | Plastic plate label removing and stamping equipment | |
| CN208968880U (en) | A kind of on-line checking sampler | |
| CN209841495U (en) | Soil sample grinding device | |
| CN209363710U (en) | A kind of willy-willy system spray room composition plate cutting apparatus | |
| CN220751810U (en) | Workbench for quality detection of building engineering | |
| CN214418909U (en) | High polymer material skiving machine with flaw detection function | |
| CN216646017U (en) | Dissolving equipment for soil detection | |
| CN216150437U (en) | Material diverging device | |
| CN219997077U (en) | Soil improvement check out test set |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |